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The cockpit floor on Allison Mustangs was Interior Green.
The wheel bays were a mix of unfinished aluminum parts (the "roof", ribs) and primed ones like the main spar, stringers, brackets etc... (yellow ZC and green ZC on some smaller parts).
These finishes could vary.

You are correct, the curvature is more pronounced at the front and almost forms a point just behind the spinner.
Keep in mind that the factory drawings are not meant to accurately represent the shape of an object, they just show the different parts with the dimensions.
Follow the dimensions and it should end up looking like the photos.
Of course these are just guidelines not absolutes, there could have been slight variations at the factory and some planes could have been repainted at some point.

The anti glare always curves on NMF Mustangs.
The low angle at which most photos are taken combined with shape of the plane's nose make it appear straight but it's an illusion.
Here is the factory drawing for the P-51H anti glare:

I agree with Slartibartfast.
I would only add that I think some F-51's did retain the WWII wing finish in Korea.
One needs to choose a specific aircraft and try to figure it out, there are too many variables.

The SCR-522 radio box (CS-80) is visible in the rear window.
This means the MN-26 radio compass and accompanying SCR-274 command set have been taken out of this aircraft.
The wire antenna is for a Detrola range receiver.

Most Allison Mustangs and the early P-51B blocks had the SCR-274 command set which required both a mast and and a wire antenna.
The later SCR-522 radio set only needed a mast.
Allison Mustangs were sometimes retrofitted with the SCR-522 set and, as GreatGonzo explained, the SCR-274 was installed on P-51B/C's equipped with a MN-26 radio compass (CBI theater).
I only disagree about the part where the planes with the MN-26 didn't use a wire when the loop antenna was mounted.
The loop is the main MN-26 antenna and was always there on MN-26 equipped aircraft whether or not the accompanying wire was also mounted.
P-51D/K's are the only ones to never use the SCR-274, with the exception of the last Dallas built production block (which had an ARC-3 set) they all came out of the factory with the SCR-522 and stayed that way.
Knowing which specific plane we are talking about is the first step towards figuring out what exact radio configuration was in.

Yes but it is one of the worst restorations out there.
It's not even a restoration, just the empty shell of an aircraft that been destroyed many times and has been rebuilt quickly (it seems) with whatever parts they could find.
It is not a good source for detail information on the A-36.

1- Neither, it started on P-51B's.
P-51's F-6A's had the lights under the forward flap of the radiator scoop and A-36's at the center of the scoop.
No lights on P-51A's (except maybe for a few modified planes) or RAF Allison Mustangs.
2- Different configurations depending on the type of radio, radio compass, IFF set etc...
Like Jennings said, you need to be more specific.
3- False.
4- Again Jennings is correct, the wingroot is larger on the D but wheels are the same.
5- Only two spinners, one for the P-51D (Hamilton Standard prop) and one for the P-51K (Aeroproducts prop).
They have the same shape but the openings for the prop blades on the K spinner have a slightly different shape.
6- At the beginning of the P-51D production canopies were free blown, this led to varying shapes.
Once they were molded the shape became standardized, mostly the well known Inglewood and Dallas canopies.
The third shape you've heard about was one of the early free blown canopies seen on P-51D-5's, the profile is a continuous curve with the windshield, the highest point being at the center of the curve.
The Tamiya 1/32 P-51D includes all three canopies.
In reality there where more than three shapes, the free blown canopies sometimes looked quite flat and even the Inglewood and Dallas canopies seem to have evolved a bit.